50 GRAM. LAB CREATED medium BLUE SAPPHIRE CORUNDUM SYNTHETIC FLAME FUSION

Description

The
Verneuil method
(or
Verneuil process
or
Verneuil technique
), also called
flame fusion
, was the first commercially successful method of manufacturing synthetic
gemstones
, developed in the late 1883
[1]
by the
French
chemist
Auguste Verneuil
. It is primarily used to produce the
ruby
,
sapphire
and padparadscha varieties of
corundum
, as well as the
diamond simulants
rutile
and
strontium titanate
. The principle of the process involves melting a finely powdered substance using an
oxyhydrogen
flame, and crystallising the melted droplets into a
boule
. The process is considered to be the founding step of modern industrial
crystal growth
technology, and remains in wide use to this day.
Corundum
has two primary gem varieties:
ruby
and sapphire. ... Because of
corundum's hardness
(pure
corundum
is defined to have 9.0 on the Mohs scale), it can scratch almost every other mineral. It is commonly used as an abrasive on everything from sandpaper to large tools used in machining metals, plastics, and wood.
FLAME FUSION CORUNDUM
CHEMICAL COMPOSITION:
Al
2
O
3
SPECIFIC GRAVITY:
3.99–4.02
REFRACTIVE INDEX:
1.761–1.769
HARDNESS:
9
DISPERSION:
0.015–0.018
FIRE/HEAT RESISTANCE:
2044 °C
PROCESS:
Verneuil/Flame Fusion/Hydrothermal
SHIP FROM THAILAND
MADE IN SWITZERLAND
QUANTITY 1 PIECES